SNOHOMISH — Dale Carlson doesn’t know if flying his 12th man flag helps the Seattle Seahawks win, but he doesn’t like to take any chances. He raised it on Sunday and the team staged an astonishing, come-from-behind 23-20 overtime win against the Houston Texans. Last season, he flew it every day while the Seahawks were in the playoffs, he said — until he was told that flying the flag without permission from his homeowners association was a violation of its rules. “I had to remove it and took it down, and the following week they lost that game,” Carlson said, referring to Seattle’s playoff game in Atlanta in January. Read more: